Apparatus for producing fire-extinguishing foam



Feb.' 17, 1931. H BURMEISTER 1,792,810

APPRATUS FOR` PRODUCING FIRE EXTINGUISHING FOAM Filed Nov. l2, 192'.

Patented Feb. 17, 1931 HAN S BURMEISTER, OF BERLIN, GERMANY, ASSIGNOR PATENT; OFFICE TO PYRENE-MIN IMAX CORPORA TION, A CORPORATION OF DELAWARE APPARATUS .'FOR PRODUCING FIRE-EXTIN GUISHIN G- FOAM Application led November 12, 1927, Serial No. 232,783,and in Germany April 27, 1927.

The present invention relates to apparatus for producing foam for fire extinguishing purposes and has for an object to provide improved means for combining powder and j; Water to form foam.

The nature and objects of the invention will be better understood from a description of a particular embodiment thereof, for the purposes of which description reference 1o should be had to the accompanying drawing forming a part hereof and in which- The gure is a central sectional view of a foam generator constructed in accordance with the principles of the invention,

In the apparatus shown for the purposes of illustration a container 5 is adapted to receive a charge of foam forming chemicals. Water is supplied through an inlet 6 terminating in a plurality of similar nozzles 7 which are directed inwardly and upwardly to project streams of water into the charge of foam forming chemicals. The inlet member 6 is surrounded by an annular opening 9 leading into the foam outlet 10. Surrounding the outlet is an upstanding battle plate 11 which cooperates with a bell-shaped deflector member 1E?,V to provide a tortuous passage for the foam as it flows from the /generator chamber to the outlet- 10. The material flowing between the upstanding deflector member 11 and the upper deflector member 12 to the outlet may contain an insuicient proportion of water and it is desirable to provide means for adding water thereto for which purpose a nozzle 15 leads from the inlet passage 6 to the outlet passage 10 and, preferably, is directed longitudinally of the latter to act more or less as an ejector element to increase the flow of foam in the outlet passage. If desired, a valve may be provided for controllin the flow through the nozzle 15 as indicated at 16.

The bell member 12 is carried by an upstanding support 17 rejecting from the casting in which are ormed the inlet and outlet conduits. Thisbell member ma desirably be provided with apertures 18 to permit foam formed in the adjacent portion of the chamber to flow into said bell member and through it to the outlet 10. The apertures Y out disturbinc the 18 are, preferably, positioned beneath ,loae plates 20, as shown. .r

It will be noted that in the arrangement shown the water inlet and foam outlet con nectlons are all made through thev bottom member of the enerator.v The side wall `member and the ottom member are separably nnected as by means of bolts 21 and the side wall member can be readily removed ich are made through the bot-n I claim: 1 Apparatus for producing foam for fire extinguishinof purposes comprisinga generator providing a chamber for foam forming powder, an inlet having a plurality of nozzles connected thereto for delivering water into the bottom portion of said chamber, a foam outlet adjacent the bottom of said. chamber and battle means about said outlet providing a tortuous passageway from with in said chamber to said outletB 2. Apparatus for producing foam for tire extinguishin purposes comprising a gens erator provi ing a chamber for foam forming powder, an inlet nozzle for delivering a stream of water into the lower portion ot' said chamber, an outlet in the bottom of said chamber, an upstanding bale plate surrounding said outlet, a bell-shaped deiector member above and surrounding said baile plate to provide a tortuous passage from said charnber to said outlet.

3. Apparatus as defined in the preceding claim wherein the delector member is pro vided with inlet openings toward the to thereof communicating with the outlet.

4. Apparatus for producing foam for tire extinguishing purposes comprising a generator providing a chamber for foam forming powder, an inlet terminating in a nozzle directed upwardly for delivering water into a charge of powder in said chamber, an out- `let for foam leading from the bottom of said titi inlet and outletconnecl chamber and a. nozzle connected with said inlet and directed into said outlet and longitudinally thereof.

5. Apparatus for producing foam for fire extinguishinmpurposes comprising a generator provi g a chamber for foam forming owder, an inlet terminating in a nozzle for eliverin water into a char e of powder in said cham r, an outlet for oem 1n substantially direct communication with the bottom of said chamber and a baille between the Y nozzle and outlet to provide a tortuous passage therebetween.

6. In apparatus for producing fire extinguishing foam a container for foam forming chemicals, an inlet for water passing through the bottom of said container, a foam outlet concentric with said inlet, and means for preventing direct discharge of Water from said inlet into said outlet Within said container.

7. In apparatus for roducing lire extinguishing foam a container for foam forming chemicals, an inlet for water passing through the bottom of said container, a plurality of nozzles connected with said inlet and adapted to distribute the Water within said container, a foam outlet surrounding said inlet, and means for preventing direct discharge of water from said inlet into said outlet within said container.

8. In apparatus for producing fire cxtinguishing foam a container for foam forming chemicals, an inlet for water passing through the bottom of said container, a foam outlet adapted to convey foam substantially directly from the bottom of said container, means for preventing direct dischar of water from said inlet into said outlet within saidcontainer, and means roviding direct communication between sai inlet and outlet outside of said container.

HANS BURLEEISTER. 

